chore(deps): override vulnerable black transitive dependency (#774)

## Summary
- Added explicit `black>=24.3.0` constraint to dev dependency group to
override the vulnerable transitive dependency from `pydoc-markdown` ->
`docspec-python` -> `black`
- Same fix as applied in
[apify-client-python#582](apify/apify-client-python#582)

## Test plan
- [x] Pre-commit hooks pass (lint + type check)
- [x] CI pipeline passes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: vdusek

pyproject.toml

@@ -64,6 +64,11 @@ scrapy = ["scrapy>=2.11.0"]
 
 [dependency-groups]
 dev = [
+    # TODO: Remove this constraint once pydoc-markdown updates its dependencies.
+    # Package pydoc-markdown is unmaintained and pins old docspec-python with vulnerable black.
+    # See https://github.com/apify/apify-client-python/pull/582/ for more details.
+    # We explicitly constrain black>=24.3.0 to override the transitive dependency.
+    "black>=24.3.0",
     "build<2.0.0",
     "crawlee[parsel]",
     "dycw-pytest-only<3.0.0",